Question

【题目】You_______ jump onto the bus while it is moving. It's too dangerous.

A. may B. may not C. must D. mustn't

Answer 1

【答案】D

【解析】句意：公共汽车行驶时你不能跳上公共汽车。太危险了。A. may可以；B. may not不可能；C. must必须；D. mustn't禁止，千万别。结合句意可知，答案为D。